In 1970 Soviet scientists began drilling straight down to see how deep they could go before the planet stopped them. Nineteen years and 12,262 meters later they'd found 2-billion-year-old plankton, free water squeezed from solid stone, and temperatures so high the rock behaved like putty. Then the money ran out, the hole was capped with a rusted metal lid, and the internet invented a scream coming from the bottom.
Megaprojects lays out the whole saga — a Cold War race with the Americans to see who could pierce deepest into the crust, and why the Soviets won it in a forest near Norway.
The reference dossier: 12,262 meters of true vertical depth, a bore only 23 centimeters wide, and the fact that after 40 years it's still the deepest artificial point on Earth.
A tight visual explainer of the engineering nightmare — drill bits that lasted hours, a bore that kept veering sideways, and heat that eventually made further drilling pointless.
The greatest hits of what came up the shaft: microscopic plankton fossils 6 km down, drilling mud 'boiling' with hydrogen, and no sign of the basalt layer everyone expected.
Focuses on the discoveries that broke the textbooks — 2.7-billion-year-old rock, liquid water where there should have been none, and 180°C stone flowing like plastic.
The unglamorous ending: after the USSR collapsed the funding evaporated, the project was abandoned in the 1990s, and the hole was welded shut with a metal cap that's still there.
The legend the borehole spawned: a viral story that drillers lowered a microphone and recorded the screams of the damned. It's fake — but it's why most people have ever heard of Kola at all.